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igmp.h revision 1.1 
      1 /*
      2  * Copyright (c) 1988 Stephen Deering.
      3  * Copyright (c) 1992 Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * Stephen Deering of Stanford University.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	@(#)igmp.h	7.1 (Berkeley) 7/8/92
     38  */
     39 
     40 /* Internet Group Management Protocol (IGMP) definitions. */
     41 
     42 /*
     43  * IGMP packet format.
     44  */
     45 struct igmp {
     46 	u_char		igmp_type;	/* version & type of IGMP message  */
     47 	u_char		igmp_code;	/* unused, should be zero          */
     48 	u_short		igmp_cksum;	/* IP-style checksum               */
     49 	struct in_addr	igmp_group;	/* group address being reported    */
     50 };					/*  (zero for queries)             */
     51 
     52 #define IGMP_MINLEN		     8
     53 
     54 #define IGMP_HOST_MEMBERSHIP_QUERY   0x11  /* message types, incl. version */
     55 #define IGMP_HOST_MEMBERSHIP_REPORT  0x12
     56 #define IGMP_DVMRP		     0x13  /* for experimental multicast   */
     57 					   /*  routing protocol            */
     58 
     59 #define IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to    */
     60 					   /*  query (in seconds)          */
     61